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1.Set up a connection between the host and the storage array.
2.Log in to the storage array management system. Create LUNs and map them to the host. Log in to the host. All mapped LUNs can be discovered.
3.On the storage array management system, expand the LUN.
4.After a successful LUN expansion, run the diskutil list command on the host. The displayed capacity was still the same as that before the LUN was expanded.
5.The capacity was displayed normally after the host was restarted.
1.Avoid online LUN expansion if possible. If it is absolutely necessary to perform an online LUN expansion, restart the host after the operation.
2.Use the offline expansion method instead, that is, delete all LUN mappings, and map them to the host again after they have been expanded.
We ran the same test on peer vendors' storage arrays, and the same symptom occurred.